The endosymbionts transferred some of their DNA to the host genome during the evolutionary transitio

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While mitochondria and plastids contain DNA and
can build proteins, they are not genetically
self-sufficient.

• The endosymbionts transferred some of their DNA
  to the host genome during the evolutionary
  transition from symbiosis to integrated
  eukaryotic organism.

Key event gene transfer form the symbiomt to the
host nucleus
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• In most cases of secondary endosymbiosis, the
  endosymbiont lost most of its parts, except its
  plastid.
• In some algae, there are remnants of the
  secondary endosymbionts.
• For example, the plastids of cryptomonad algae
  contain vestiges of the endosymbiotic nucleus,
  cytoplasm, and even ribosomes.
• Thus, a cryptomonad is a complex chimera, like a
  box containing a box containing a box.

The cryptomonad situation
Brown algae, diatoms, Cryptomonads, Euglena etc
Secondary plastid
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